/// <summary>
/// ファイルから読込(宛先、送信元は読み込まない)
/// </summary>
/// <param name="filename">ファイル名</param>
/// <returns>(件名, 本文)</returns>
public static (string, string) LoadFromFile(string filename)
{
byte[] data = File.ReadAllBytes(filename);
string subjectText = "";
string bodyText = "";
// ボディ部の先頭を見つける
int indexBody = 0;
for (int i = 0; i < data.Length; ++i)
{
if (CharCodeUtils.IsCrLf(data, i) && CharCodeUtils.IsCrLf(data, i + 2))
{
indexBody = i + 4;
break;
}
}
if (indexBody == 0)
{
throw new Exception("形式が違います: ボディ部が存在しません。");
}
string headers = Encoding.ASCII.GetString(data, 0, indexBody);
subjectText = GetSubjectText(headers);
bodyText = GetBodyText(data, indexBody);
return(subjectText, bodyText);
}
/// <summary>
/// 全角文字の文字コード(JIS)から文字を取得する
/// </summary>
/// <param name="jiscode">JIS コード</param>
/// <returns>文字(1文字): 取得できない場合は null</returns>
public static string GetCharFromJisCode(int jiscode)
{
(byte high, byte low) = CharCodeUtils.SplitHL(jiscode);
if (0x21 <= high && high <= 0x7e)
{
// OK
}
else
{
return(null);
}
if (0x21 <= low && low <= 0x7e)
{
// OK
}
else
{
return(null);
}
byte[] bistr = new byte[] {
JIS_BEGIN_ESCAPE_SEQUENCE[0],
JIS_BEGIN_ESCAPE_SEQUENCE[1],
JIS_BEGIN_ESCAPE_SEQUENCE[2],
high, low,
JIS_END_ESCAPE_SEQUENCE[0],
JIS_END_ESCAPE_SEQUENCE[1],
JIS_END_ESCAPE_SEQUENCE[2]
};
string result = null;
try {
result = jisEncoding.GetString(bistr);
} catch (Exception ex) {
System.Diagnostics.Debug.WriteLine(ex.Message);
}
return(result);
}
/// <summary>
/// 本文を JIS エンコーディングした MemoryStream を返す
/// NOTE: 半角カタカナは処理できないので渡さないこと
/// </summary>
/// <param name="bodyText">本文</param>
/// <returns>エンコーディング内容を格納した MemoryStream</returns>
private static MemoryStream GetBodyStream(string bodyText)
{
int maxBodyCols;
if (DataBags.Config.ForceInsertLineFeed)
{
maxBodyCols = DataBags.Config.MaxBodyCols * 2;
}
else
{
maxBodyCols = int.MaxValue;
}
MemoryStream stream = new MemoryStream();
int cols = 0;
bool jisIn = false;
for (int i = 0; i < bodyText.Length; ++i)
{
string sch = bodyText.Substring(i, 1);
if (StringUtils.IsAsciiWithControl(sch))
{
if (jisIn)
{
CharCodeUtils.WriteJisEndEscapeSequence(stream);
}
jisIn = false;
if (sch[0] == '\n')
{
CharCodeUtils.WriteCrLf(stream);
cols = 0;
}
else
{
char ascii = sch[0];
stream.WriteByte((byte)(ascii & 0xFF));
++cols;
}
}
else
{
if (!jisIn)
{
CharCodeUtils.WriteJisBeginEscapeSequence(stream);
}
jisIn = true;
int jiscode;
Emoji emoji = DataBags.Emojis.GetFromUnicode(sch[0]);
if (emoji != null)
{
jiscode = emoji.Jiscode;
}
else
{
jiscode = CharCodeUtils.GetJisCodeFromChar(sch);
if (jiscode == 0)
{
jiscode = CharCodeUtils.JIS_WHITE_SPACE_CODE;
}
}
(byte high, byte low) = CharCodeUtils.SplitHL(jiscode);
stream.WriteByte(high);
stream.WriteByte(low);
cols += 2;
}
if (maxBodyCols <= cols)
{
if (jisIn)
{
CharCodeUtils.WriteJisEndEscapeSequence(stream);
}
CharCodeUtils.WriteCrLfWithFlowed(stream);
if (jisIn)
{
CharCodeUtils.WriteJisBeginEscapeSequence(stream);
}
cols = 0;
}
}
if (jisIn)
{
CharCodeUtils.WriteJisEndEscapeSequence(stream);
}
return(stream);
}
/// <summary>
/// 件名を固定長に分け、BASE64 エンコーディングして返す
/// NOTE: 改行は処理できないので渡さないこと
/// NOTE: 半角カタカナは処理できないので渡さないこと
/// </summary>
/// <param name="subjectText">件名</param>
/// <param name="maxCols">件名を分けるための長さ</param>
/// <returns>複数の BASE64 文字列の一覧</returns>
private static List <string> GetBase64EncodingBlocks(string subjectText, int maxCols)
{
List <string> base64EncodingBlocks = new List <string>();
MemoryStream stream = new MemoryStream();
int cols = 0;
bool jisIn = false;
for (int i = 0; i < subjectText.Length; ++i)
{
string sch = subjectText.Substring(i, 1);
if (StringUtils.IsAsciiWithControl(sch))
{
if (jisIn)
{
CharCodeUtils.WriteJisEndEscapeSequence(stream);
}
jisIn = false;
char ascii = sch[0];
stream.WriteByte((byte)(ascii & 0xFF));
++cols;
}
else
{
if (!jisIn)
{
CharCodeUtils.WriteJisBeginEscapeSequence(stream);
}
jisIn = true;
int jiscode;
Emoji emoji = DataBags.Emojis.GetFromUnicode(sch[0]);
if (emoji != null)
{
jiscode = emoji.Jiscode;
}
else
{
jiscode = CharCodeUtils.GetJisCodeFromChar(sch);
if (jiscode == 0)
{
jiscode = CharCodeUtils.JIS_WHITE_SPACE_CODE;
}
}
(byte high, byte low) = CharCodeUtils.SplitHL(jiscode);
stream.WriteByte(high);
stream.WriteByte(low);
++cols;
}
if (maxCols <= cols)
{
if (jisIn)
{
CharCodeUtils.WriteJisEndEscapeSequence(stream);
}
base64EncodingBlocks.Add(GetBase64EncodingBlock(stream));
stream = new MemoryStream();
if (jisIn)
{
CharCodeUtils.WriteJisBeginEscapeSequence(stream);
}
cols = 0;
}
}
if (jisIn)
{
CharCodeUtils.WriteJisEndEscapeSequence(stream);
}
if (0 < stream.Length)
{
base64EncodingBlocks.Add(GetBase64EncodingBlock(stream));
}
return(base64EncodingBlocks);
}
/// <summary>
/// ヘッダ文字列から件名を取得する
/// NOTE: 自分で出力した形式にしか対応していない
/// </summary>
/// <param name="headers">ヘッダ文字列</param>
/// <returns>件名</returns>
private static string GetSubjectText(string headers)
{
int startIndex = headers.IndexOf(MailMessage.SUBJECT, 0, StringComparison.CurrentCultureIgnoreCase);
if (startIndex < 0)
{
return("");
}
startIndex += MailMessage.SUBJECT.Length;
int index = startIndex;
int endIndex = startIndex;
while (true)
{
index = headers.IndexOf("\r\n", index);
if (index < 0)
{
break;
}
if (headers.Length <= index + 2)
{
break;
}
endIndex = index;
if (headers[index + 2] != ' ' && headers[index + 2] != '\t')
{
break;
}
index += 2;
}
if (endIndex == startIndex)
{
return("");
}
string subject = headers.Substring(startIndex, endIndex - startIndex);
Regex regex = new Regex(@"=\?(?<charset>.*?)\?(?<encoding>.)\?(?<value>.*?)\?=");
StringBuilder result = new StringBuilder();
MatchCollection matchCollection = regex.Matches(subject);
foreach (Match match in matchCollection)
{
if (match.Success)
{
string charset = match.Groups["charset"].Value.ToLower();
string encoding = match.Groups["encoding"].Value.ToLower();
string val = match.Groups["value"].Value;
if (charset == "iso-2022-jp" && encoding == "b")
{
// OK
}
else
{
// 未対応
return("");
}
byte[] dataPart = Convert.FromBase64String(val);
bool inJpn = false;
int dataPartLength = dataPart.Length;
for (int i = 0; i < dataPartLength;)
{
if (CharCodeUtils.IsBeginEscapeSequence(dataPart, i))
{
inJpn = true;
i += 3;
continue;
}
if (CharCodeUtils.IsEndEscapeSequence(dataPart, i))
{
inJpn = false;
i += 3;
continue;
}
if (inJpn)
{
if (i <= dataPartLength - 2)
{
int jiscode = CharCodeUtils.MergeHL(dataPart[i], dataPart[i + 1]);
Emoji emoji = DataBags.Emojis.GetFromJiscode(jiscode);
if (emoji != null)
{
result.Append(emoji.Unicode);
}
else
{
string sch = CharCodeUtils.GetCharFromJisCode(jiscode);
if (sch != null)
{
result.Append(sch);
}
}
i += 2;
}
else
{
i += 1;
}
}
else
{
char ascii = (char)dataPart[i];
result.Append(ascii);
i += 1;
}
}
}
}
return(result.ToString());
}
/// <summary>
/// ボディ部データから本文を取得する
/// NOTE: 自分で出力した形式にしか対応していない
/// </summary>
/// <param name="data">ボディ部データ</param>
/// <param name="offset">オフセット</param>
/// <returns>本文</returns>
private static string GetBodyText(byte[] data, int offset)
{
bool inJpn = false;
int dataLength = data.Length;
StringBuilder result = new StringBuilder();
for (int i = offset; i < dataLength;)
{
if (CharCodeUtils.IsCrLf(data, i))
{
inJpn = false;
i += 2;
result.Append("\r\n");
continue;
}
if (CharCodeUtils.IsBeginEscapeSequence(data, i))
{
inJpn = true;
i += 3;
continue;
}
if (CharCodeUtils.IsEndEscapeSequence(data, i))
{
inJpn = false;
i += 3;
continue;
}
if (inJpn)
{
if (i <= dataLength - 2)
{
int jiscode = CharCodeUtils.MergeHL(data[i], data[i + 1]);
Emoji emoji = DataBags.Emojis.GetFromJiscode(jiscode);
if (emoji != null)
{
result.Append(emoji.Unicode);
}
else
{
string sch = CharCodeUtils.GetCharFromJisCode(jiscode);
if (sch != null)
{
result.Append(sch);
}
}
i += 2;
}
else
{
i += 1;
}
}
else
{
char ascii = (char)data[i];
result.Append(ascii);
i += 1;
}
}
return(result.ToString());
}